CORRECTION #1 

They must make their double bed slowly at university for a year

How must they make their double bed at university for a year?

They made their double bed slowly at university yesterday.

Where did they make their double bed slowly yesterday?

They are going to make their double bed slowly at university next week.

When are they going to make their double bed slowly at university?

They have made their double bed slowly at university since 2010

How long have they made their double bed at university?